mail archive of the barebox mailing list
 help / color / mirror / Atom feed
From: Renaud Barbier <Renaud.Barbier@ametek.com>
To: Barebox List <barebox@lists.infradead.org>
Subject: Subject: [PATCH 1/3] ARM:lib32: add architected timer
Date: Wed, 1 Mar 2023 16:59:30 +0000	[thread overview]
Message-ID: <BL0PR07MB56653CD55ED2742BBC7561CCECAD9@BL0PR07MB5665.namprd07.prod.outlook.com> (raw)

Subject: [PATCH 1/3] ARM:lib32: add architected timer

In preparation for the introduction of the LS1021A support,
add a specific timer support based on the LS1046A support so
that delays can be used in the PBL.

Signed-off-by: Renaud Barbier <renaud.barbier@ametek.com>
---
 arch/arm/lib32/Makefile |  1 +
 arch/arm/lib32/pbl.c    | 17 +++++++++++++++++
 include/clock.h         |  2 ++
 3 files changed, 20 insertions(+)
 create mode 100644 arch/arm/lib32/pbl.c

diff --git a/arch/arm/lib32/Makefile b/arch/arm/lib32/Makefile
index 82507fffc0..1be8d70c45 100644
--- a/arch/arm/lib32/Makefile
+++ b/arch/arm/lib32/Makefile
@@ -31,6 +31,7 @@ extra-y += barebox.lds
 pbl-y	+= lib1funcs.o
 pbl-y	+= ashldi3.o
 pbl-y	+= div0.o
+pbl-y	+= pbl.o
 
 obj-pbl-y	+= setjmp.o
 
diff --git a/arch/arm/lib32/pbl.c b/arch/arm/lib32/pbl.c
new file mode 100644
index 0000000000..83b49656cb
--- /dev/null
+++ b/arch/arm/lib32/pbl.c
@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <asm/system.h>
+#include <clock.h>
+#include <common.h>
+
+/* Unlike the ARMv8, the timer is not generic to ARM32 */
+void arm_architected_timer_udelay(unsigned long us)
+{
+	unsigned long long ticks, cntfrq = get_cntfrq();
+	unsigned long long start = get_cntpct();
+
+	ticks = us * cntfrq + 999999;
+	do_div(ticks, 1000000);
+
+	while ((long)(start + ticks - get_cntpct()) > 0);
+}
diff --git a/include/clock.h b/include/clock.h
index e6197e7eb0..8e07c35d37 100644
--- a/include/clock.h
+++ b/include/clock.h
@@ -35,6 +35,8 @@ uint32_t clocksource_hz2mult(uint32_t hz, uint32_t shift_constant);
 int is_timeout(uint64_t start_ns, uint64_t time_offset_ns);
 int is_timeout_non_interruptible(uint64_t start_ns, uint64_t time_offset_ns);
 
+void arm_architected_timer_udelay(unsigned long us);
+
 void ndelay(unsigned long nsecs);
 void udelay(unsigned long usecs);
 void mdelay(unsigned long msecs);
-- 
2.27.0




             reply	other threads:[~2023-03-01 17:01 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-03-01 16:59 Renaud Barbier [this message]
2023-03-01 17:41 ` Ahmad Fatoum
2023-03-02 10:57   ` Renaud Barbier
2023-03-03  9:23   ` Renaud Barbier
2023-03-03 11:57     ` Sascha Hauer
2023-03-03 14:44     ` Ahmad Fatoum

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=BL0PR07MB56653CD55ED2742BBC7561CCECAD9@BL0PR07MB5665.namprd07.prod.outlook.com \
    --to=renaud.barbier@ametek.com \
    --cc=barebox@lists.infradead.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox